GW instek GPS-4303, GPS-4251, GPS-3303, GPS-2303 Adjustment Manual

GPS

4303/ 4251/ 3303/ 2303

Verification/ Adjustment Manual

GPS-4303/ 4251/ 3303/ 2303

Table of Contents

Table of Contents
How to Use this Manual................................................	4
Specification...............................................................	5
Front Panel ................................................................	7
Performance Verification ..............................................	9
Overall Procedure............................................................	9
Verification Equipment .....................................................	9
Output Voltage Verification ..............................................	10
Tracking Series Voltage Verification...................................	12
Output Current Verification ..............................................	14
Tracking Parallel Current Verification .................................	16
Current Load Regulation Verification .................................	18
Ripple Current Verification ...............................................	20
Voltage Load Regulation Verification..................................	22
Tracking Series Load Regulation/ Ripple Verification ............	24
Ripple Voltage Verification ...............................................	26
Recording Tables ............................................................	28
Adjustment ...............................................................	31
Overall Procedure...........................................................	31
Adjustment Equipment....................................................	31
Opening the Case...........................................................	32
Adjustment Point ...........................................................	33
Output Voltage Adjustment..............................................	37
Tracking Series Voltage Adjustment ..................................	40
Output Current Adjustment .............................................	42
Tracking Parallel Current Adjustment.................................	44
Overload Indicator Adjustment.........................................	46
	3

GPS Verification/ Adjustment Manual

How to Use this Manual

This manual describes how to verify and adjust the performance of GPS-4303/ 4251/ 3303/ 2303 Multiple Output D.C. Power Supplies.

Specification, page5, shows GPS electronic and mechanical specifications. It also shows the locations of relevant verification and adjustment procedures in this manual.

Front Panel, page7, describes the front panel switches, terminals, and indicators. The Default Settings column shows the basic panel settings applicable to all verification and adjustment items.

Performance Verification, page9, shows how to verify GPS performance, step by step. Check the necessary equipment and the overall procedure before start working on each item.

Adjustment, page31, shows how to adjust GPS specification. Same as Performance Verification, check the equipment and the overall procedure before start working on each item.

4

Specification

Specification

				GPS-4303
	Output Mode		CH1, 2	CH3	CH4	Verification	Adjustment
	Voltage	0	~ 30V	2.2 ~ 5.2V	8 ~ 15V	Page10	Page37
	Current	0	~ 3A	1A Max.	1A Max.	Page14	Page42
	Tracking Series	0	~ 60V	---	---	Page12	Page40
	Voltage
	Tracking Parallel	0	~ 6A	---	---	Page16	Page44
	Current
				GPS-4251
	Output Mode		CH1, 2	CH3	CH4	Verification	Adjustment
	Voltage	0	~ 25V	3 ~ 6V	8 ~ 15V	Page10	Page37
	Current	0	~ 0.5A	2.5A Max.	1A Max	Page14	Page42
	Tracking Series	0	~ 50V	---	---	Page12	Page40
	Voltage
	Tracking Parallel	0	~ 1A	---	---	Page16	Page44
	Current
				GPS-3303
	Output Mode		CH1, 2	CH3	CH4	Verification	Adjustment
	Voltage	0	~ 30V	5V Fixed	---	Page10	Page37
	Current	0	~ 3A	3A Max.	---	Page14	Page42
	Tracking Series	0	~ 60V	---	---	Page12	Page40
	Voltage
	Tracking Parallel	0	~ 6A	---	---	Page16	Page44
	Current
				GPS-2303
	Output Mode		CH1, 2	CH3	CH4	Verification	Adjustment
	Voltage	0	~ 30V	---	---	Page10	Page37
	Current	0	~ 3A	---	---	Page14	Page42
	Tracking Series	0	~ 60V	---	---	Page12	Page40
	Voltage
	Tracking Parallel	0	~ 6A	---	---	Page16	Page44
	Current

(Continued on next page)

5

GPS Verification/ Adjustment Manual

	Constant Voltage Operation (CH1, CH2)			Verification	Adjustment
	Line Regulation	≤ 0.01% + 3mV		---	---
	Load Regulation	≤ 0.01% + 3mV (rating current ≤ 3A)		Page22	---
		≤ 0.02% + 5mV (rating current > 3A)
	Ripple & Noise	≤ 1mVrms, 5Hz ~ 1MHz		Page26	---
	Recovery Time	≤ 100μS (50% Load Change,	---		---
		Minimum Load 0.5A)
	Constant Current Operation (CH1, CH2)			Verification	Adjustment
	Line Regulation	≤ 0.2% + 3mA		---	---
	Load Regulation	≤ 0.2% + 3mA		Page18	---
	Ripple Current	≤ 3mArms		Page20	---
	Tracking	Operation (CH1, CH2)		Verification	Adjustment
	Tracking Error	≤ 0.5%(CH1) + 10mV		Page12	Page41
	Series Regulation	≤ 300mV	---		---
	Load Regulation	≤ 0.01% + 3mV		Page24	---
	Ripple & Noise	≤ 2mVrms, 5Hz ~ 1MHz		Page24	---
		CH3 Output		Verification	Adjustment
	Line Regulation	≤ 5mV		---	---
	Load Regulation	≤ 15mV		Page22	---
	Ripple & Noise	≤ 2mVrms, 5Hz ~ 1MHz		Page26	---
		CH4 Output		Verification	Adjustment
	Line Regulation	≤ 5mV		---	---
	Load Regulation	≤ 10mV		Page22	---
	Ripple & Noise	≤ 2mVrms, 5Hz ~ 1MHz		Page26	---
		Meter		Verification	Adjustment
	Model	3 Digits, 0.5” LED display		---	---
	Out ON Accuracy	± (0.5% rdg + 2 digits)		Page10, 14	Page38, 43
	Out OFF Accuracy	± (0.5% rdg + 8 digits)		Page10, 12,	Page39, 41,
		* GPS-2303: ± (0.5% rdg + 2 digits)	14, 16		43, 45
		Insulation		Verification	Adjustment
	Chassis and Terminal	≥ DC 500V/ 20MΩ		---	---
	Chassis and AC Cord	≥ DC 500V/ 30MΩ	---		---
		Power Source		Verification	Adjustment
	AC 100V/ 120V/ 220V (± 10%)/ 230V (+10% ~ −6%), 50/ 60Hz			---	---
	Dimensions & Weight			Verification	Adjustment
	255(W) x 145(H) x 265(D) mm, 7kg *GPS-4251: 6.3kg			---	---

6

Front Panel

Front Panel

Description and Default Settings

No	Description		Default		GPS-	GPS-	GPS-	GPS-
			Settings		4303	4251	3303	2303
1	Power Switch		ON		*	*	*	*
2	CH4 − Output Terminal				*	*
3	CH4 + Output Terminal				*	*
4	CH2 C.V./ C.C. Indicator				*	*	*	*
	Green : Constant Voltage (C.V.)
	Red : Constant Current (C.C.)
5	CH2 − Output Terminal				*	*	*	*
6	CH2 + Output Terminal				*	*	*	*
7	GND Terminal		Connect to		*	*	*	*
			Ground
8	CH1 − Output Terminal		Connected		*	*	*	*
9	CH1 + Output Terminal		Connected		*	*	*	*

7

GPS Verification/ Adjustment Manual

No

Description

Default

GPS-

GPS-

GPS-

GPS-

Settings

4303

4251

3303

2303

10

CH1 C.V./ C.C. Indicator

*

*

*

*

Green : Constant Voltage (C.V.)

Red : Constant Current (C.C.)

11

CH3 − Output Terminal

*

*

*

12

CH3 + Output Terminal

*

*

*

13

CH3 Overload Indicator

*

*

*

14

CH1/ CH3 Selector

CH1

*

*

15

CH3 Voltage Control

Minimum

*

*

16

CH1 Voltage Control

Minimum

*

*

*

*

17

CH1/ CH3 Voltage Meter

*

*

CH1

CH1

Only

Only

18

CH1 Current Control

Minimum

*

*

*

*

19

CH1/ CH3 Current Meter

*

*

CH1

CH1

Only

Only

20

Mode Switch

Independent

Independent

*

*

*

*

22

Series

Parallel

21

CH2/ CH4 Voltage Meter

*

*

CH2

CH2

Only

Only

23

CH2 Voltage Control

Minimum

*

*

*

*

24

CH2/ CH4 Current Meter

*

*

CH2

CH2

Only

Only

25

CH2 Current Control

Minimum

*

*

*

*

26

CH4 Voltage Control

Minimum

*

*

27

CH2/ CH4 Selector

CH2

*

*

28

Output Switch

OFF

*

*

*

*

29

Output Indicator

*

*

*

*

30

CH4 Overload Indicator

*

*

8

Performance Verification

Performance Verification

Overall Procedure

1.Prepare the Equipment according to the following table.

2.Set the front panel according to the Default Settings (page7).

3.Verify a specification item and record the result (page10 to 26). The recording tables are at the end of this chapter (page28).

4.Repeat step 3 for all items.

5.In case of overor under-specification, continue with the relevant item in the Adjustment chapter (page31).

Verification Equipment

	Equipment		Required Specification		Used in	Recommended
							Model
		•	AC & DC Voltage
	Digital		Accuracy: < ±0.1%		All items	•	GDM-8245
		•	DC Current Range: ≥ 6A
	Multimeter					•	GDM-8246
		•	DC Current Accuracy:
			<±0.1%
	2nd Digital	•	AC & DC Voltage	•	Ripple Current	•	GDM-8245
	Multimeter		Accuracy: < ±0.1%			•	GDM-8246
		•	DC Voltage Range: ≥ 60V	•	Load Regulation
	Electronic Load	•	DC Current Range: ≥ 6A	•	Ripple Voltage	•	Agilent
		•	CV, CC, CR Mode	•	Ripple Current		N3305A
		•	Short Mode
	AC Power	• Capacity: ≥ 1k VA					APS-9102
		•	Frequency: 50 – 60Hz	•	Ripple Voltage	•
	Supply	•	Line Voltage: ±10%			•	Agilent 6813B
		*230V: −6% ~ +10%
	GPS –	•	Voltage rating: > 60V		All items	---
	Multimeter
		•	Current rating: > 6A
	cable
	GPS – 2nd					---
	Multimeter	•	Voltage rating: > 30V	•	Ripple Current
	cable
	GPS –	•	Voltage rating: > 60V	•	Load Regulation
	Electronic Load			•	Ripple Voltage	---
	cable	•	Current rating: > 6A	•	Ripple Current
	Calculator	•	For calculating the		All items	---
			acceptance ranges
							9

GPS Verification/ Adjustment Manual

Output Voltage Verification

Here we verify Minimum Output Voltage, Maximum Output Voltage, and Voltage Meter Accuracy.

Connection

GPS Series

Digital Multimeter

V

A

- 4 +

- 2 +

- 1 +

- 3 +

Verification steps

1.Set the front panel according to Default Settings, page7.

2.Connect the Multimeter to CH1 and turn ON the Output Switch.

Minimum Output Voltage

3.(CH1, CH2 only) Turn up the Current Control to full.

4.(CH1, CH2 only) Make sure the indicator shows C.V. (green).

5.Record the Multimeter readout as Minimum Output Voltage.

Maximum Output Voltage

6.Turn up the Voltage Control to full.

7.(CH1, CH2 only) Make sure the indicator shows C.V. (green).

8.Record the Multimeter readout as Maximum Output Voltage.

Out ON Meter Accuracy

9.Record the GPS readout. Calculate the difference between the previous Multimeter readout and record it as Out ON Meter Accuracy.

Out OFF Meter Accuracy

10. Turn OFF the Output Switch.

10

Performance Verification

11.Record the GPS readout. Calculate the difference between the previous GPS readout (Output ON) and record it as Out OFF Meter Accuracy.

12.Switch the GPS connection to the next channel and turn ON the Output Switch.

13.Repeat step 3 to 12 for CH2, CH3, and CH4.

Acceptance range: Output Voltage

	GPS-4303			GPS-4251		GPS-3303		GPS-2303
CH1	Min: < −30mV			Min: < −30mV		Min: < −30mV
	Max: 30V +3% ~			Max: 25V +3% ~		Max: 30V +3% ~ +8% (30.9 ~
	+8% (30.9 ~ 32.4)			+8% (25.75 ~ 27)		32.4)
CH2	Min: < −30mV					Min: < −30mV
	Max: > CH1 +0.2V					Max: > CH1 +0.2V
	Min: 2.2V ±8%		Min: 3.0V ±8%			Min: 5.0V ±8%
CH3	(2.024 ~ 2.376)		(2.76 ~ 3.24)
						(4.6 ~ 5.4)
	Max: 5.2V ±8%		Max: 6.0V ±8%			Max: N/A
	(4.784 ~ 5.616)		(5.52 ~ 6.48)
CH4	Min: 8.0V ±8% (7.36 ~ 8.64)
	Max: 15.0V ±8% (13.8 ~ 16.2)

Acceptance range: Voltage Meter Accuracy

GPS-4303 GPS-4251 GPS-3303 GPS-2303

CH1

Out ON: ±(0.5% rdg + 2digits) CH2 Out OFF: ±(0.5% rdg + 8digits)

CH3

CH4

Out ON: ±(0.5% rdg + 2digits) Out OFF: ±(0.5% rdg + 8digits)

N/A

Out ON: ±(0.5% rdg + 2digits)

Out OFF: N/A

When out of range…

Refer to Output Voltage adjustment, page37.

11

GPS Verification/ Adjustment Manual

Tracking Series Voltage Verification

Here we verify Tracking Series Minimum Voltage, Tracking Error, and Tracking Series Meter Accuracy.

Connection

GPS Series

Digital Multimeter

V

A

- 4 +

- 2 +

- 1 +

- 3 +

Verification steps

1.Set the front panel according to Default Settings, page7.

2.Connect the Multimeter to CH1 and turn ON the Output Switch.

Tracking Series Minimum Voltage

3.Turn up the Current Control to full and set the Tracking Switch to Series.

4.Make sure the indicator shows C.V. (green) for both CH1 and CH2.

5.Turn up the Voltage control to 1.0V and record the Multimeter readout.

6.Switch the GPS connection to CH2, turn up the Current Control to full, and record the Multimeter readout.

7.Calculate the difference between the CH1 readout and record it as Tracking Series Minimum Voltage.

Tracking Error

8.Switch the GPS connection to CH1, turn up the Voltage Control to full, and record the Multimeter readout.

12

Performance Verification

9.Make sure the indicator shows C.V. (green) for both CH1 and CH2.

10.Switch the GPS connection to CH2, turn up the Voltage Control to full, and record the Multimeter readout.

11.Calculate the difference between CH1 and record it as Tracking Error.

Tracking Series Meter Accuracy

12.Switch the GPS connection to CH1 and record the GPS readout. Turn OFF the Output Switch and record the GPS readout.

13.Calculate the difference between Output ON and OFF GPS readout and record it as CH1 Tracking Series Meter Accuracy.

14.Switch the GPS connection to CH2 and record the GPS readout. Turn ON the Output Switch and record the GPS readout.

15.Calculate the difference between Output ON and OFF GPS readout and record it as CH2 Tracking Series Meter Accuracy.

Acceptance range

	GPS-4303	GPS-4251		GPS-3303		GPS-2303
	Minimum Voltage: ±10mV			Minimum Voltage: ±10mV
	Error: ≤ 0.5% of CH1 + 10mV			Error: ≤ 0.5% of CH1 + 10mV
CH1	Meter Accuracy: ±(0.5% rdg +			Meter
				Accuracy: ±		N/A
CH2		8digits)		(0.5% rdg +
				8digits)

When out of range…

Refer to Tracking Series Voltage adjustment, page40.

13

GPS Verification/ Adjustment Manual

Output Current Verification

Here we verify Minimum Output Current, Maximum Output Current, and Current Meter Accuracy.

Connection

GPS Series

Digital Multimeter

V

A

- 4 +

- 2 +

- 1 +

- 3 +

Verification steps

1.Set the front panel according to Default Settings, page7.

2.Connect the Multimeter to CH1 and turn ON the Output Switch.

Minimum Output Current

3.Turn up the Voltage Control to full.

4.(CH1, CH2 only) Make sure the indicator shows C.C. (red).

5.(CH1, CH2 only) Record the Multimeter readout as Minimum Output Current.

Maximum Output Current

6.(CH1, CH2 only) Turn up the Current Control to full.

7.(CH1, CH2 only) Make sure the indicator shows C.C. (red).

8.(CH3, CH4 only) Make sure the Overload indicator turns on.

9.Record the Multimeter readout as Maximum Output Current.

Out ON Meter Accuracy

10.Record the GPS readout. Calculate the difference between the previous Multimeter readout and record it as Out ON Meter Accuracy.

14