31
4-17 Calibrating the D/A in 10Hz
∼
100Hz range of SW MODE
n
Set voltage of POWER SUPPLY to 60V and current of it to 1A.
o
Connect the positive output terminal of POWER SUPPLY to a 0.1
Ω
5W concrete resistance first, then
connect the resistance to the input terminal of the electronic load. Hook up a DMM in 200V range with
the input terminal of the load. Connect the input terminal of COUNTER to both ends of the concrete
resistance.
p
Test the input terminal of the load by the 200V range of a DMM. Press SHIFT and C.V. MODE, then key
in 3, 8, 1,6, and
↵
. Then adjust the POWER SUPPLY until the DMM display reads 60.00V.
q
When MEMORY indicates “01” and A indicates “CL16”, key in the frequency reading (7 digits including
decimal) of the COUNTER (in unit of “Hz”) and press
↵
.
r
When MEMORY indicates “02”, key in the frequency reading (7 digits including decimal) of the
COUNTER (in unit of “Hz”) and press
↵
.
s
When MEMORY indicates “03”, key in the frequency reading (7 digits including decimal) of the
COUNTER (in unit of “Hz”) and press
↵
.
t
When MEMORY indicates “04”, key in the frequency reading (7 digits including decimal) of the
COUNTER (in unit of “Hz”) and press
↵
.
u
When MEMORY indicates “05”, key in the frequency reading (7 digits including decimal) of the
COUNTER (in unit of “Hz”) and press
↵
.
v
When MEMORY indicates “06”, key in the frequency reading (7 digits including decimal) of the
COUNTER (in unit of “Hz”) and press
↵
.
Note:
Applied instruments -- POWER SUPPLY (60V, 6A); DMM (5 1/2 digits);
COUNTER (frequency counter)
Applied situation --The readings of FREQ. and DUTY are not reliable.
