Tenma 72-6851 & 72-6853 Instruction manual
Specification
OUTPUT SPECIFICATIONS
Output Voltage Range:
0V to 35.3V (35V/10A); 0V to 18.15V (18V/20A).
Output Current Range:
0.01A to 10.2A (35V/10A); 0.01A to 20.2A (18V/20A).
Output Voltage Setting:
Direct keyboard entry or quasi-analogue rotary control; setting
resolution 10mV.
Output Current Setting:
Direct keyboard entry or quasi-analogue rotary control; setting
resolution 10mA.
Output Mode:
Constant voltage or constant current with automatic crossover.
Output Switch:
Electronic. Preset voltage and current displayed when off.
Output Terminals:
4mm terminals on front panel, screw terminals at rear.
Sensing:
Remote via rear panel screw terminals or direct via shorting strip
(supplied).
Output Impedance:
<1m
Ω
in constant voltage mode.
>5k
Ω
in constant current mode (voltage limit at max.).
Output Protection:
Forward protection by Over-Voltage-Protection (OVP) trip;
maximum voltage that should be applied to the terminals is 50V.
Reverse protection by diode clamp for reverse currents up to 3A.
OVP Setting:
Direct keyboard entry.
OVP Range:
1V to 40V (35V/10A); 1V to 25V (18V/20A).
OVP Delay:
<200µs
Load & Line Regulation:
<0.01% of maximum output for 90% load change or 10% line
change.
Ripple & Noise:
<1mV rms typical in constant voltage.
<3mA rms typical in constant current.
HF Common Mode Noise:
Typically <3mV rms, <10mV peak.
Transient Response:
20µs to within 50mV of setting for 90% load change.
Temperature Coefficient:
typically <100 ppm/°C.
Protection Functions:
Overvoltage trip; regulator overtemperature; sense miswiring.
Status Indication:
Output off lamp; constant voltage mode lamp;
constant current mode lamp; trip message on display.
METER SPECIFICATIONS
Meter Types:
Dual 4 digit meters with 12.5mm (0.5") LEDs. Reading rate 4Hz.
Meter Resolution:
10mV, 10mA
Meter Accuracy:
Voltage 0.2% of reading ± 1 digit, current 0.5% of reading ±1 digit.
KEYBOARD FUNCTIONS
Delta Mode:
Increase or decrease voltage or current in user-selectable steps.
Store/Recall:
Store and recall voltage, current and OVP levels from non-volatile
memory (25 memories).
Interface Selection:
Set digital interface type (RS232 or GPIB), baud rate and address.
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