GW Instek GPP-4323 Four-Output Programmable DC Power Supply

Key Features At A Glance

• Four-output configuration: CH1 0–32V/3A, CH2 0–32V/3A, CH3 0–5V/1A, CH4 0–15V/1A
• High setting resolution of 1 mV / 0.1 mA with read-back resolution of 0.1 mV / 0.1 mA
• Low ripple noise ≤350 µVrms and ≤2 mArms with transient response time ≤50 µs
• Tracking series and parallel function via internal circuit — no additional external wiring required
• CH1/CH2 load function operates in CC, CV, and CR modes for basic battery charge/discharge testing
• Hardware-based OVP, OCP, and OTP protection with user-settable OVP/OCP action points
• 4.3-inch TFT LCD displays setting values, measurement values, and output waveform
• RS-232, USB, and Ext I/O standard for automated measurement systems; LAN or GPIB+LAN available as factory-installed options

The GW Instek GPP-4323 is a four-output programmable DC power supply in the GPP-Series, providing CH1 at 0–32V/0–3A, CH2 at 0–32V/0–3A, CH3 at 0–5V/0–1A, and CH4 at 0–15V/0–1A. The series delivers up to 217W of total output power and is designed as a multi-channel bench supply for laboratory and production-bench applications, combining programmable control with independent on/off switching for each channel.

GW Instek lists the GPP-Series as suited to school and research institute work, energy storage device development, the semiconductor industry, and consumer electronics development. The CH1/CH2 load function — operating in constant-current, constant-voltage, and constant-resistance modes — allows a single instrument to act as both source and load for basic battery charge and discharge testing, addressing the energy storage application directly without a separate electronic load.

Brand Heritage

GW Instek is the test and measurement brand of Good Will Instrument Co., Ltd., a Taiwanese instrument manufacturer founded in 1975. The company has operated continuously under the Good Will Instrument name since founding, with the GW Instek brand applied to its bench instrument lines. There are no major corporate acquisitions or name changes in the GW Instek lineage — the brand and the manufacturer have been stable for nearly five decades.

Compare Other Models in This Series

The GPP-Series is a four-model family of multi-output programmable DC power supplies sharing a common chassis, display, and control architecture, differentiated by channel count and per-channel output ratings. All four models deliver the same 1 mV / 0.1 mA setting resolution, 0.1 mV / 0.1 mA read-back resolution, hardware-implemented OVP/OCP/OTP protection, and standard RS-232, USB, and Ext I/O interfaces.

GW Instek positions the family for school and research institute use, energy storage device development, semiconductor work, and consumer electronics development. The single-channel GPP-1326 anchors the family at 32V/6A, while the multi-channel GPP-2323, GPP-3323, and GPP-4323 add channels for designs that require multiple independent rails on one instrument.

Each model below is its own product page with new-matched pricing. Click through to the model that matches your channel count and per-channel ratings; the comparison table that follows is provided so you can confirm the right configuration before ordering.

Within the GPP-Series, the GPP-4323 is the four-output configuration: two 0–32V/0–3A channels (CH1, CH2) that support tracking series, tracking parallel, and the CC/CV/CR load function, plus a 0–5V/0–1A channel (CH3) and a 0–15V/0–1A channel (CH4). The added CH3 and CH4 outputs make the GPP-4323 the choice when a design needs four independent rails — for example, a primary supply rail, a precision low-voltage logic rail, and a separate auxiliary rail — without bringing a second instrument onto the bench.

The four models in the GPP-Series differ primarily in channel count and per-channel ratings. The GPP-1326 is a single 0–32V/0–6A output. The GPP-2323 provides two 0–32V/0–3A outputs (CH1, CH2) with tracking series/parallel and the load function. The GPP-3323 adds a 1.8V/2.5V/3.3V/5.0V selectable, 5A third channel with a USB Type-A output terminal.

Choose by counting the independent rails the design requires and matching the per-channel voltage and current ratings. The comparison table below lists the relevant differences side by side.

Model	Channels	Output Range	Max Output Power
GPP-4323	4	CH1/CH2: 0~32V/0~3A; CH3: 0~5V/0~1A; CH4: 0~15V/0~1A	217 W
GPP-1326	1	0~32V / 0~6A	192 W
GPP-2323	2	CH1/CH2: 0~32V / 0~3A	192 W
GPP-3323	3	CH1/CH2: 0~32V/0~3A; CH3: 1.8/2.5/3.3/5.0V/5A	217 W

Additional differences in specifications beyond the few shown above are not listed here — see each model's full specifications below.

Accessories Supplied

• User Manual x 1
• Power cord x 1
• Test Lead GTL-104A x 2
• Test Lead GTL-105A x 2

Product Core & Specifications

Specification	GPP-4323	GPP-3323	GPP-2323	GPP-1326
OUTPUT MODE
Number of Channels	4 (CH1, CH2, CH3, CH4)	3 (CH1, CH2, CH3)	2 (CH1, CH2)	1 (CH1)
Voltage	CH1: 0~32V; CH2: 0~32V; CH3: 0~5V; CH4: 0~15V	CH1: 0~32V; CH2: 0~32V; CH3: 1.8/2.5/3.3/5.0V	CH1: 0~32V; CH2: 0~32V	CH1: 0~32V
Current	CH1: 0~3A; CH2: 0~3A; CH3: 0~1A; CH4: 0~1A	CH1: 0~3A; CH2: 0~3A; CH3: 5A	CH1: 0~3A; CH2: 0~3A	CH1: 0~6A
Tracking Series Voltage	0~64V	0~64V	0~64V	—
Tracking Parallel Current	0~6A	0~6A	0~6A	—
CONSTANT VOLTAGE OPERATION
Line Regulation	≤0.01%+3mV
Load Regulation	≤0.01%+3mV (rating current ≤3A); ≤0.02%+5mV (rating current >3A)
Ripple & Noise (5Hz~1MHz)	≤350µVrms	≤350µVrms	≤350µVrms	≤500µVrms
Recovery Time	≤50µs	≤50µs	≤50µs	≤100µs
CONSTANT CURRENT OPERATION
Line Regulation	≤0.2%+3mA
Load Regulation	≤0.2%+3mA
Ripple & Noise	≤2mArms	≤2mArms	≤2mArms	≤4mArms
PROGRAMMING RESOLUTION
Voltage	1mV	1mV	1mV	1mV
Current	0.1mA	0.1mA	0.1mA	0.2mA
TRACKING OPERATION (CH1, CH2)
Tracking Error	≤0.1%+10mV of Master (0~32V, No Load, with Load add Load regulation ≤100mV)
Parallel Regulation	Line: ≤0.01%+3mV; Load: ≤0.01%+3mV (rating current ≤3A); ≤0.02%+5mV (rating current >3A)
Series Regulation	Line: ≤0.01%+5mV; Load: ≤100mV
Ripple & Noise	≤1mVrms, 5Hz~1MHz
CH3 OPERATION (GPP-3323)
Output Voltage	1.8V / 2.5V / 3.3V / 5.0V, ±5%
Output Current	5A
Line Regulation	≤3mV
Load Regulation	≤5mV
Ripple & Noise	2mVrms (5Hz~1MHz)
Transient Recovery Time	100µs
USB Port Output	1.8V / 2.5V / 3.3V / 5.0V, ±0.35V, 3A
METER
Voltage Resolution	0.1mV	0.1mV	0.1mV	0.1mV
Current Resolution	0.1mA	0.1mA	0.1mA	0.2mA
Setting Accuracy (Voltage)	≤±(0.03%+10mV)	≤±(0.03%+10mV)	≤±(0.03%+10mV)	≤±(0.03%+10mV)
Setting Accuracy (Current)	≤±(0.30%+10mA)	≤±(0.30%+10mA)	≤±(0.30%+10mA)	≤±(0.30%+10mA)
Readback Accuracy (Voltage)	≤±(0.03%+10mV)	≤±(0.03%+10mV)	≤±(0.03%+10mV)	≤±(0.03%+10mV)
Readback Accuracy (Current)	≤±(0.30%+10mA)	≤±(0.30%+10mA)	≤±(0.30%+10mA)	≤±(0.30%+10mA)
DC LOAD CHARACTERISTIC
Channel	2	2	2	1
Display Power	0~50.00W	0~50.00W	0~50.00W	0~100.00W
Display Voltage	1~33.00V	1~33.00V	1~33.00V	1~33.00V
Display Current	0~3.200A	0~3.200A	0~3.200A	0~6.200A
CV Mode Setting Range	1.500V~33.00V	1.500V~33.00V	1.500V~33.00V	1.500V~33.00V
CV Mode Resolution	10mV	10mV	10mV	10mV
CV Mode Set Accuracy	≤0.1%+30mV	≤0.1%+30mV	≤0.1%+30mV	≤0.1%+30mV
CV Mode Read Accuracy	≤0.1%+30mV	≤0.1%+30mV	≤0.1%+30mV	≤0.1%+30mV
CC Mode Setting Range	0~3.200A	0~3.200A	0~3.200A	0~6.200A
CC Mode Resolution	1mA	1mA	1mA	1mA

Important: Tracking series mode combines CH1 and CH2 into a 0–64V output; tracking parallel mode combines them into a 0–6A output. Confirm the tracking mode matches the DUT requirement before enabling output.Important: LAN and GPIB+LAN interface options are Manufacturer Installed Only and cannot be retrofitted after purchase.Important: The GPP-3323 CH3 OVP/OCP protection action point is not user-settable (per datasheet: OVP/OCP functions allow users to set the protection action point except CH3 of GPP-3323).

Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.