Chroma 61501, Руководство пользователя, Страница: 63 / 134

Calibration
4-7
1. The resistance of applied load must be constant, so that the load
current is proportional to output voltage. If not, the step B of
CURRENT MEAS. ACCURACY is insignificant. Users only need
to meet the current of step C when output voltage is 125VAC.
2. When doing the procedure of calibration, the protection is removed
temporarily. It may cause damage of AC source if applying
unsuitable load.
4.2.3 External Vref Calibration
Users can enter CALIBRATION CHOICE page after pressing password (see 4.2). Then,
press
3
,
ENTER
, to do the external Vref calibration. See detailed as below. It is not
necessary to do this item if no option board (GPIB, RS-232 and Vref board) is installed.
In above step A of EXTERNAL Vref CALI., short the external Vref input terminal to make
input is 0V, then the display shows the measured Vdc from AC source. They are offset
voltages produced by internal components. Wait two seconds then press
ENTER
, then Vdc
= 0V.
Then press
SHIFT
, then to change to next step.
3. EXTERNAL PROGRAM CALI 150V RNG
A. Vref INPUT SHORT
WAIT TWO SECONDS THEN ( ENTER )
Vdc = 0.00 V
T
3. EXTERNAL PROGRAM CALI 150V RNG
B. INPUT EXT. V 5VDC - WAIT TWO SECONDS
KEYIN EXT. V DVM MEAS.
0.000 VDC ( ENTER )
CALIBRATION CHOICE = 3
1. V OUT AND MEAS. 2. I MEAS.
3. EXT Vref.
Please Remove Load Before Calibrating
Press <ENTER> to start