HAMEG HM 303-4 User manual

®

Instruments

Oscilloscope

HM 303-4

ENGLISH 4S-0303-04E0 10 JUN 1998

SERVICE-MANUAL HM303-4

Subject to change without notice

1

Y-Preamplifier CH I (YP-Board).................................. 4

Y-Preamplifier CH II (YP-Board)................................. 5

Y-Intermediate Amplifier and Trigger Amplifier

(YP-Board) ................................................................. 6

YPA-Board (Top side)................................................. 7

YPA-Board (Bottom side) .......................................... 8

XY-Amplifier, YF-Amplifier, OS-Circuit ....................... 9

XY-Board (Top side) ................................................. 10

XY-Board (Bottom side)........................................... 11

Sync.-Amplifier........................................................ 12

Time base................................................................ 13

Sweep-Generator .................................................... 14

TB-Board ................................................................. 15

CRT-Board ............................................................... 16

CRT-Board (Top and Bottom side) ........................... 17

Power Supply (PS-Board)........................................ 18

PS-Board (Top side)................................................. 19

PS-Board (Bottom side) .......................................... 20

Component tester, Calibrator .................................. 21

CCT-Board (Top and Bottom side) ........................... 22

Front-Control Board................................................. 23

Front-Control Board (Top and Bottom side) ............ 24

ADJUSTMENT PROCEDURE ................................. 25

Table of contents

Service Manual

Circuit Diagrams

Adjustment Procedure

HM303-4

St. 100698. Hüb/goRR

Subject to change without notice

2

Subject to change without notice

3

30MHz Standard Oscilloscope HM303

Accessories supplied: Line cord, Operators Manual, 2 Probes 1:1/10:1

Specifications

Vertical Deflection

Operating modes: Channel I or II separate,

both Channels (alternated or chopped),

(Chopper frequency approx. 0.5MHz).

Sum or difference with Ch. I and Ch. II

(both channels invertable).

XY-Mode: via channel I and channel II

Frequency range: 2xDC to 30MHz (−3dB)

Risetime: <12ns.

Overshoot ≤1%.

Deflection coefficients: 12 calibrated steps

from 5mV/div. to 20V/div. (1-2-5 sequence)

with variable 2.5:1 up to 50V/div.

Accuracy in calibrated position: ±3%

Y-expansion x5 (calibrated) to 1mV/div. (±5%)

in the frequency range from DC - 10MHz (–3dB)

Input impedance: 1MΩ II 20pF.

Input coupling: DC-AC-GD (ground).

Input voltage: max. 400V (DC + peak AC).

Triggering

Automatic: (peak to peak) <20Hz-100MHz (≤ 0.5div.)

Normal with level control: DC-100MHz (≤0.5div.)

ALT. Triggering; LED indicator for trigger action

Slope: positive or negative,

Sources: Channel I or II, CH. I alternating CH II,

line, external

Coupling: AC (10Hz to 100MHz),

DC (0 to 100MHz),

LF (0 to 1.5kHz)

Active TV-Sync-Separator (pos. and neg.)

External: ≥0.3p-p from 30Hz to 30MHz

Horizontal Deflection

Time coefficients: 20 calibrated steps

from 0.2s/div. - 0.1µs/div. in 1-2-5 sequence

Accuracy in calibrated position: ±3%.

Min. speed incl. variable 2.5:1 up to 0.5s/div.

with X-Mag. x10: ±5%; 10ns/div.: ±8%

Holdoff time: variable to approx. 10:1

Bandwidth X-amplifier: 0-3MHz (−3dB).

Input X-Amplifier via Channel II,

(sensitivity see Channel II specification)

X-Y phase shift: <3° below 220kHz.

Component Tester

Test voltage: approx. 6Vrms (open circuit).

Test current: approx. 5mArms (shorted).

Test frequency: approx. 50Hz

Test connection: 2 banana jacks 4mm ∅

One test lead is grounded (Safety Earth)

General Information

CRT: D14-364GY/123 or ER151-GH/-,

6" rectangular screen (8x10cm)

internal graticule

Acceleration voltage: approx 2000V

Trace rotation: adjustable on front panel

Calibrator: square-wave generator (tr <4ns)

≈1kHz / 1MHz; Output: 0.2V ±1% and 2V

Line voltage: 100-240V AC ±10%, 50/60Hz

Power consumption: approx. 36 Watt at 50Hz.

Min./Max. ambient temperature: 0°C...+40°C

Protective system: Safety class I (IEC 1010-1)

Weight: approx. 5.6kg, color: techno-brown

Cabinet: W 285, H 125, D 380 mm

Lockable tilt handle

5/96

Screen photo of 1 MHz square wave signal

Screen photo of 50 and 100MHz

sine wave with alternate triggering

The new HAMEG HM303 oscilloscope succeeds the HM203 (over 170,000

sold worldwide). The bandwidth has been extended from 20 to 30MHz, the sweep

rate increased to 10ns/div. and improvements added to the already legendary

HAMEG auto triggering system. The HM303 is the ideal instrument for waveform

display in the DC to 100MHz frequency range.

A key feature of this oscilloscope is the vertical amplifier's pulse fidelity, limiting

overshoot to only 1%. The HM303 offers a special fast rise time 1kHz/1MHz

Calibrator, permitting high quality probe compensation across the entire frequency

range to ensure probe-tip thru to display integrity. An Overscan Indicator assists

in vertical display amplitude and position adjustment.

The HM303 is capable of triggering on input waveforms over 100MHz and on

signal levels as small as 0.5 division. Alternate triggering mode enables the

display of two asynchronous signals simultaneously. An active Video Sync-

Separator permits detailed examination of complex TV signal inputs. A well

proven, built-in component tester is now equipped with a stabilized measuring

voltage. The use of a switching type of power supply minimizes both weight and

power consumption and universally accepts a wide range of input power line

voltages, without the requirement to change jumpers or switch positions. The

HM303's CRT is fully mu-metal shielded against outside magnetic fields.

HAMEG is setting new price/performance breakthroughs with the introduction

of this fine oscilloscope. This performance packed scope will tempt all users to run

it through its paces.

OSCILLOSCOPES

Dual Channel, DC to 30MHz, 1mV/div.; Overscan Indicator

Time Base: 0.2s to 10ns/div.; Variable Holdoff; Alternate Triggering

Triggering: DC-100MHz; Auto Peak to Peak; Active TV-Sync-Separator

Additional Features: Component Tester, 1kHz/1MHz Calibrator

Subject to change without notice

4

Y-Preamplifier CH I (YP-Board)

Subject to change without notice

5

Y-Preamplifier CH II (YP-Board)

Subject to change without notice

6

Y-Intermediate Amplifier and Trigger Amplifier (YP-Board)

Subject to change without notice

7

YPA-Board (Top side)

Subject to change without notice

8

YPA-Board (Top side)

Subject to change without notice

9

XY- Amplifier, YF- Amplifier, OS- Circuit

Subject to change without notice

10

XY Board (Top side)

Subject to change without notice

11

XY Board (Top side)

Subject to change without notice

12

Sync.- Amplifier

Subject to change without notice

13

Time base

Subject to change without notice

14

Sweep- Generator

Subject to change without notice

15

TB Board

Subject to change without notice

16

CRT- Board

Subject to change without notice

17

CRT Board (Top and Bottom side)

Subject to change without notice

18

Power Supply (PS-Board)

A

B

C

D

87654321

D

C

B

A

12345678

Title : Rev.:

R

Date :

Document Number :

MPT

MPT MPT

MPT

8

1

2

3

4

5

6

7

8

9

10

11

12 13

16

15

14

17

DR1001

ETD39/303

P1001

Power Recept.

S1001

NT

R1001

NTC 8

C1006

2200p

Y 250V

U

R1005

S14K275

C1003

0.33u

X2 250V

14

32

L1001

2x33mH 1A

C1002

0.1u

X2 250V

R1019

1K00

R1030

681R

R1020

75K

D1007

BZV55B16

C1001

4700p

Y 250V

+

C1011

68u 400V

+

C1025

68u 400V

F1001

0.5AF

R1037

8K25

R1031

200K

1

2

4

6

5

IC1001

CNY17-2Z

R1068

1K3

R1065

1K3

C1027

220p 400V

R1018

100K

411

R1060

4K99

6

3

2

8

5

1

4

7

IC1003

C1041

0.1u 50V

+

C1020

220u 16V

R1045

10K0

C1012

1n 250V

R1039

200R

R1032

5K11

R1026

47K5 R1033

1K82

R1008

1K0

23

D1011

BAS20

D1017

BYD37M

R1017

100K

411

1

32

T1003

STHV82FI

ISOWATT 218

R1013

R207

200K

R1021

75K

C1005

2200p

Y 250V

3

21

IC1002

TL431C

TO-92A

C1021

100p 2kV

D1022

BYD77G

D1019

BYD77G

R1010

R207

90R9

D1027

BYD37M

+

C1026

330u 25V

+

C1029

1000u 16V

+

C1023

1000u 16V

+

C1022

330u 25V

C1033

0.1u 400V

MKT

L1005

68uH 1.5A

L1004

68uH 1.5A

L1003

220uH 1A

C1035

10n 400V

MKT

D1025

DD1400

D1024

DD1400

D1016

DD1400

1

2

3

4

5

6

P1010

WIRE6

+

C1009

100u 35V

D1014

BYD37M

D1012

BYT01-400

+

C1015

100u 16V

R1035

22R

R1015

0R22

2W

2

3

1

T1011

BC850c

SOT-23

1

2

3

T1009

BC860

SOT-23

c

C1044

1n 50V

R1059

1K00

R1047

22K1

4

2

1

3

D1001

FL406

+

C1030

10u 250V

+

C1017

1u 50V

+

C1028

22u 160V

D1026

BYD37M

3

2

1

T1004

TO-126

BD434

2

3

1

T1012

BC850

SOT-23

c

R1062

619R

+

C1032

100u 16V

R1053

619R

1

2

3

T1008

BC860

SOT-23

c

3

21

T1002

BD433

TO-126 C1042

1n 50V

R1061

10K0

R1056

10K0

+

C1034

100u 16V

R1054

3K01

-

+3

2

1

IC1004A

TL082CN

R1055

511R

R1043

7K50

C1045

0.1u 50V

C1046

0.1u 50V

2

31

T1006

BF822

R1024

1M00

R1011

10M0

VR37

R1034

1M00

R1027

0R0

R1023

750K

C1004

47n 2kV

D1010

BZV55C75

R1067

1K00

R1057

4K32

2

3

1

T1007

BF822

SOT-23

R1012

6M81

VR37

R1064

47K5

R1044

475K

R1041

475K

R1040

10K0

R1006

470K

R1007

1M00

1

2

3

T1005

BC860

SOT-23

c

C1018

10n 400V

C1024

68p 3KV

C1007

10n 400V

C1010

0.1u 100V

R1004

470K

R1003

470K

C1043

10n 50V

R1069

8K25

1

2

3

4

5

6

P1003

WIRE6

R1028

1M00

D1005

LL4151

D1018

LL4151

R1058

750K

R1046

22K1

1

2

3

4

5

6

P1005

WIRE6

B1003

1

2

3

4

5

6

P1002

MOLEX6S

R1002

332K

VR37

+Vcc

-Vcc

4

8

IC1004C

TL082CN

C1019

10n 2kV

R1025

27k4

R1014

0R39

2

31

T1010

BC850

SOT-23

c

R1052

511R

R1051

12K1

D1015

LL4151

-

+5

6

7

IC1004B

TL082CN

R1063

2k21

3

21

IC1005

TL431C

TO-92A

R1071

1K0

R1072

3K32

R1016

1K0

R1070

1K00

D1023

LL4151

R1066

7K50

R1029

1M00

R1009

R207

90R9

B1007

D1013

LL4151

D1020

BYD37M

D1021

BYD37M

1

2

3

4

5

6

P1008

WIRE6

B1008

B1009

B1011

1

2

3

4

5

6

P1009

WIRE6

L1006

68uH 1.5A

C1016

0.1u 100V

1

2

3

5

4

6

7

8

9

10

B1010

D1009

BYD37M

D1004

BYV27-100

D1003

BYV27-100

R1022

1K82

R1036

750K

R1042

750K

B1013

+

C1031

22u 160V

L1007

68uH 1.5A

+

C1036

10u 250V

C1037

0.1u 250V

MKT

13

14

15

16

17

18

19

20

21

C1040

0.1u 50V

R1038

0R0

C1039

4n7 50V

D1006

LL4151

R1050

332K

R1048

301K

R1049

56K2

1

3

2

T1001

BUX86

TO-126

B1001

R1073

R207

1K0

R1074

75K

+

C1038

1u 50V

LINE

+185V

+141V

31V

+12V

-12V

+12V

G1

LINE

+12V

-12V

G1

-13.5V

+13.5V

12.9V

0.4V

+13.5V

-13.5V

HVC

+12V

-12V

+141V

+185V

-12V

+12V

6.3V

FOKUS

HT14

-1950V

+12V

BLV

HT1

HT14

-2025V

HT1

Subject to change without notice

19

PS-Board (Top side)

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HAMEG HM 303-4 User manual

HAMEG HM 303-4 User manual

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