Tenma 72-10495 - User Manual

The TENMA 72-10495, 72-10500, and 72-10505 are digital-control DC power supplies designed for various applications. The 72-10495 model offers two channels with 30V-5A output, while the 72-10500 and 72-10505 models provide two channels with 30V-3A output. The 72-10505 also includes an additional 5V-3A channel. These devices are characterized by their low noise, compact size, and light weight, making them suitable for indoor use in dust-free, non-conductive environments.

Function Description:

The power supplies operate in both constant voltage (CV) and constant current (CC) modes, automatically switching between them as needed. They feature digital panel control for setting output parameters, including voltage and current. Each channel has a 4-digit display for both voltage and current, offering a resolution of 10mV/1mA. The devices support output On/Off control and include a beep output for audible feedback.

Important Technical Specifications:

Models:
- 72-10495: 30V-5A x 2 Channels
- 72-10500: 30V-3A x 2 Channels
- 72-10505: 30V-3A x 2 Channels & 5V-3A x 1 (for CH3)
Voltage Range: 0-30V (CH1, CH2), 5V (CH3 for 72-10505)
Current Range: 0-5A (72-10495), 0-3A (72-10500, 72-10505 CH1, CH2), 3A (CH3 for 72-10505)
Resolution: 10mV/1mA
Load Regulation (Voltage): ≤0.01%+3mV (72-10500, 72-10505), ≤0.01%+5mV (72-10495)
Load Regulation (Current): ≤0.1%+5mA (72-10500, 72-10505), ≤0.1%+10mA (72-10495)
Line Regulation (Voltage): ≤0.01%+3mV (72-10500, 72-10505), ≤0.01%+3mV (72-10495)
Line Regulation (Current): ≤0.1%+3mA (72-10500, 72-10505), ≤0.1%+3mA (72-10495)
Setup Resolution (Voltage): 10mV
Setup Resolution (Current): 1mA
Setup Accuracy (Voltage, 25°C±5°C): ≤0.5%+20mV
Setup Accuracy (Current, 25°C±5°C): ≤0.5%+5mA (72-10500, 72-10505), ≤0.5%+10mA (72-10495)
Ripple (20-20M, Voltage): ≤1mVrms (72-10500, 72-10505), ≤2mVrms (72-10495)
Ripple (20-20M, Current): ≤3mArms
Temperature Coefficient (Voltage/Current): ≤150ppm
Read Back Accuracy (Voltage/Current): 10mV/1mA
Reaction Time (Voltage Rise/Drop): ≤100ms (10% Rated load)
Load Regulation of Parallel (Voltage): ≤0.1%+0.5V
Load Regulation of Series (Voltage): ≤0.1%+0.1V
AC Input Voltage: 110V/120V/220V/230V, 50/60 Hz
Operating Temperature: 0-40°C
Storage Temperature: -10-70°C
Relative Humidity: <80% (Operation), <70% (Storage)
Altitude: <2000m
Dimensions (WHD): 220156260mm
Weight: 6.5kg (72-10500), 6.7kg (72-10505), 9.1kg (72-10495)

Usage Features:

Output Parameter Setup: Users can adjust voltage and current levels using coarse and fine controls. The device stores up to five panel setup configurations internally (M1-M5) for quick recall.
Output On/Off Control: Each channel has an independent On/Off button.
Series and Parallel Connections: The power supply supports series and parallel operation for its multiple channels. In series mode, the output voltage is the sum of the voltages on CH1 and CH2, with CH2 acting as the main control. In parallel mode, the output current is the sum of the currents on CH1 and CH2, with CH2 again being the main control.
- Important Note for Series/Parallel: OCP and OVP functions do not work in series and parallel modes, even if their LEDs are on.
- Series Mode Caution: Do not leave a load connected to CH2 in SER (serial) mode. Recalling a CH2 memory in SER mode only updates CH2 and turns it off, leaving CH2 output terminals with up to -1.2V (reverse polarity) and a short circuit current of up to -2.8A.
Safety Protections:
- Overload Protection (OCP): Protects against overcurrent conditions.
- Overvoltage Protection (OVP): Protects against excessive output voltage.
- Reverse Polarity Protection: Prevents damage from incorrect polarity connections.
- Short Circuit Protection: Safeguards the device and load from short circuits.
- Important Note for OCP/OVP: OCP and OVP LEDs are situated on the CH1 display but indicate the state for whichever channel's OCP/OVP button was last pressed. Pressing either button for a channel toggles its state and updates both LEDs. The OCP and OVP enabled states are not saved with memory recalls and are always set to off when the power supply powers up.
Panel Lock: A key lock function prevents accidental changes to settings. Pressing the "LOCK" key for over 2 seconds locks/unlocks the panel.
Beep On/Off: The beep sound can be toggled on/off by pressing and holding the OCP/BEEP button for 2 seconds.
Calibration: The device supports software calibration for voltage and current. This involves a zero calibration and a full-range calibration for both voltage and current, using a benchtop multimeter and an electronic load. Calibration procedures are repeated for each channel in multi-channel models.

Maintenance Features:

Fuse Replacement: The device uses specific fuse types (e.g., T10A/250V for 72-10495 at 110V/120V input). To ensure fire protection, fuses must be replaced only with the specified type and rating after disconnecting the power cord and fixing the cause of the blowout.
Cooling System: Features a low-noise cooling fan controlled by heatsink temperature, which helps maintain optimal operating conditions. Users should ensure that cooling fan vents are not blocked.
General Safety Guidelines: Avoid severe impacts or rough handling. Do not discharge static electricity. Disassembly should only be performed by qualified service personnel.
Important Safety Precaution: Do not allow the power supply to sink current (e.g., when charging a battery, use a diode). For sensitive circuits, disconnect the load before switching the load on/off, or switching mains power off with the load switched on.