Tenma 72-6851 & 72-6853 Instruction manual
The shorting links should be re-made between the rear sense and output terminals when remote
sensing is not being used. However, the sense connection is also made internally through a low
value resistor and only a small error between the set and actual voltage will result if the links are
left disconnected.
Sense Miswiring Trip
The output will be tripped off if the sense wires are wired to the wrong output or if an attempt is
made to draw power from the sense wires; the
trip
message will be shown in both displays.
The system will then attempt to recover from the trip and, if successful (because the wiring has
been corrected), the
trip
message will be removed and normal operation will resume.
Output Protection
In addition to OVP for forward overvoltage protection, the output is protected from reverse
voltages by a diode; the continuous reverse current must not exceed 3 Amps, although transients
can be much higher.
Maintenance and Repair
For service repair and calibration please contact your local Tenma distributor or go to
www.tenma.com
Fuse
The correct fuse type is:
10 Amp 300V HBC time-lag, 5 x 20mm
Make sure that only fuses with the required rated current and of the specified type are used for
replacement. The use of makeshift fuses and the short-circuiting of fuse-holders is prohibited.
To replace the fuse, first disconnect the instrument from the AC supply. Remove the 6 cover
securing screws and lift off the cover. Replace the fuse with one of the correct type and refit the
cover.
Note that the main function of the fuse is to make the instrument safe and limit damage in the
event of failure of one of the switching devices. If a fuse fails it is therefore very likely that the
replacement will also blow, because the supply has developed a fault; in such circumstances the
instrument will need to be returned to the manufacturer for service.
Cleaning
If the PSU requires cleaning use a cloth that is only lightly dampened with water or a mild
detergent. Polish the display window with a soft dry cloth.
WARNING! TO AVOID ELECTRIC SHOCK, OR DAMAGE TO THE PSU, NEVER ALLOW
WATER TO GET INSIDE THE CASE. TO AVOID DAMAGE TO THE CASE OR DISPLAY
WINDOW NEVER CLEAN WITH SOLVENTS.
10
www.tenma.com
electronic components distributor
