MST-MHT SERIES 071320
3-11
3.9.5
OUTPUT CURRENT I
O
ZERO ADJUST (R51)
This procedure adjusts the offset of the current comparison amplifier to be zero for a pro-
grammed output current of zero.
1. Issue commands from the host computer to set the UUT to Current Mode, program output
current to 0.0A, voltage limit to E
MAX
, enable the output and disconnect the load.
2. Verify CURRENT MODE indicator is on and OUTPUT ENABLED indicator is on with load not
connected. If CURRENT MODE indicator is off, turn R51 counterclockwise until CURRENT
MODE indicator is on.
3. Connect voltmeter to test connector J5, pins 4 (CSNS - Current Sense) and 6 (GND) and
verify voltmeter reads 0.0000V ± 500
V. If voltmeter reading is outside these limits, adjust
potentiometer R51 for 0.0000V ± 100
V.
3.9.6
VOLTAGE REFERENCE ADJUST (R47)
This procedure adjusts the internal full scale reference voltage to produce the full scale output
voltage E
MAX
when the full scale voltage is programmed.
1. Issue commands (
VOLT MAX;:CURR MAX;: OUTP ON
) from the host computer to set the
UUT to Voltage Mode, program current limit to I
MAX
, output voltage to E
MAX
and enable the
output.
2. Verify VOLTAGE MODE and OUTPUT ENABLED indicators are on.
3. Connect the voltmeter to DC output connector (see Figure 2-3) pin 5, Sense 1 (+) and
pin 2, Sense 2 (–) and verify measured value is within ± 1 LSB (1/4096) of E
MAX
. If mea-
sured value exceeds the acceptable range, adjust potentiometer R47 to E
MAX
, within the
R47 adjustment tolerance of ± 0.5 LSB (1/8192) of E
MAX
.
3.9.7
CURRENT REFERENCE ADJUST (R48)
This procedure establishes the maximum value of the internal current reference voltage so that
the readback current matches the programmed current.
1. Turn off UUT and connect precision shunt across DC Output connector pin 6, Output 1 (+),
and pin 3, Output 2 (–).
2. Turn on UUT.
3. Issue commands from the host computer to set the UUT to Current Mode, program output
current (I
O
) to 0.99 x I
MAX
, voltage limit to E
MAX
and enable the output.
4. Verify that CURRENT MODE and OUTPUT ENABLED indicators are on.
5. Issue commands from the host computer to read back current.
6. Verify that the read back value (step 5) is within ± 1 LSB (4096) of the programmed value
(step 3). If readback value exceeds acceptable range, adjust R48 for readback value within
±0.5 LSB (1/8192) of the programmed value.
Содержание MST 100-2MHT
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