4-8
BHK-MG 1/2 OPR 030916
8. The text window reads
Connect shunt across output
. Connect precision shunt resis-
tor (see PAR. 4.2) OUT and –OUT terminals. After connecting the shunt click
OK
button.
9. The text window reads
With shunt connected across output, connect DVM
across shunt
. Connect DVM (high) to the shunt sensing terminal that correlates to +OUT
and DVM (low) to the shunt sensing terminal that correlates to –OUT. Click
OK
button to
proceed to next step.
10.The text window reads
CURR ZERO Adjust
. Using the fine adjust
<
and
>
buttons (see
PAR. 4.5.3), adjust output until DVM is as close to 0 as possible but slightly positive, then
click
OK
button.
11. The text window reads
CURR F.S.Adjust
. Using the coarse
<<
and
>>
and fine
<
and
>
buttons (see PAR. 4.5.3), adjust output current until the DVM voltage reading corresponds as
closely as possible, but above, the rated maximum current, e.g., 0.08 Amperes (80mA) for
the BHK 500-80MG. Use
I
= E/R where E is the DVM reading (Volts), R is measured value of
the precision shunt resistor (Ohms) used to indirectly measure
I
, the rated BHK-MG current
in Amperes. Click the
OK
button when complete.
12.The Current Magnifier window opens (see Figure 4-6). The unit automatically sets output
current to less than 1/10th the rated nominal current (approximately 8% of nominal current
range). The DVM measures the voltage across the shunt. Indirectly measure the output cur-
rent in Amperes using
I
= E/R where E is the DVM reading (Volts) and R is measured value
of the precision shunt resistor (Ohms). Enter the indirectly measured current value (in milli-
Amperes) in the field provided and click
OK
.
NOTE: The range of useful values for calibrating current magnification has a tolerance of
±10%. For example, if the measured value entered for the BHK 500-80MG is between
8.8 and 7.4 mA, current magnification will be calibrated. If the value is outside this
range the unit uses the default value of 8.0 mA and current magnification is not cali-
brated. Note that this calibration only improves the accuracy of the output current read-
back value, and does not affect the setting value.
FIGURE 4-6. CURRENT MAGNIFIER WINDOW
13. The text window reads
CAL Done, Disconnect Shunt
. Click
OK
. Current calibration is
complete and automatically saved. Disconnect the external shunt and DVM.
Summary of Contents for BHK-MG Series
Page 2: ......
Page 6: ......
Page 16: ......
Page 18: ...xii BHK MG030916 FIGURE 1 1 BHK MG 40W SERIES PROGRAMMABLE POWER SUPPLY...
Page 26: ...1 8 BHK 1 2 MG OPR 030916 FIGURE 1 3 RA 24 RACK ADAPTER WITH TWO 1 2 RACK BHK MG 40W UNITS...
Page 35: ...BHK 1 2 MG SERIES 030916 2 3 FIGURE 2 2 BHK MG SERIES REAR PANEL CONTROLS AND CONNECTIONS...
Page 100: ...3 54 BHK 1 2 MG 030916 FIGURE 3 20 SERIES AUTOMATIC CONFIGURATION...
Page 113: ...BHK 1 2 MG 030916 3 67 FIGURE 3 25 PARALLEL MASTER SLAVE CURRENT MODE CONFIGURATION...
Page 150: ......
