one corner of the DVM PCB has a nylon washer
acting as an insulator/separator from its corner
stand off support)
must be
. Save this nylon washer as it
be returned to its PCB metal standoff
location when the adjustment procedure is fin-
ished. Slightly lift and tilt the right hand side of
the DVM PCB to give you access to all the
DMM trimpot locations ( needed for voltage
and current measurement adjustments). All
voltage adjustments should be performed with
DC Voltage Standard input
with an AC Voltage Standard. DC Voltage input
from a DCV standard provides the most stable
AMPTEC 601ES voltage reading for calibration
purposes.
Select the 600V range and input 0.00 VDC
from the DC Voltage standard. Adjust RV101 to
read 000.0 volts.
Still on the 600V range input 600.0 VDC
from the DC Voltage standard. Adjust RV102 to
read 600.0 volts.
Select the 200V range and input 100.00 VDC
from the DC Voltage standard. Adjust RV105 to
read 100.0 volts.
Select the 20V range and input 10.000 VDC
from the DC Voltage standard. Adjust RV104 to
read 10.000 volts.
Select the 2 V range and input 1.0000 VDC
from the DC Voltage standard. Adjust RV103 to
read 1.000 volts.
You may now verify all the above voltage
ranges with input from an AC Voltage standard
to determine compliance.
Select the 600V range and provide 600VAC
@60Hz input, then verify the range is in specifi-
cation.
Select the 200V range and provide 100VAC
@60Hz input, then verify the range is in speci-
fication.
Select the 20V range and provide 10VAC
@60Hz input, then verify the range is in specifi-
cation.
Select the 2 V range and provide 1.0 VAC
@60Hz input, then verify the range is in speci-
fication.
All trimpot adjustments ( i.e RV401)
described for this section are also located on the
DMM PCB.
then later verify
3.
4.
5.
6.
7.
8.
A)
B)
C)
D)
F-3-6 AC/DC Current Adjustments
1)
the battery compartment
). When adjusting
RV405,
which is indicated as
a negative sign.
Select the 20 Kohm range. Connect the Kel-
vin clips to the 10 Kohm standard resistor.
Select the 2 0 Ohm range. Connect Kelvin
leads to the AMPTEC 601ES Safety DMM.
Short the Kelvin Clip leads at the end
.
do not over adjust
F-3-3. 2.0 Ohm Range Adjustments con't
(zero)
Adjust RV402 on the DVM PCB for a
reading of 1.0000 ohms. Over adjustment is
indicated by a negative polarity sign.
F-3-2. Full Scale Adjustment
1.
F-3-3. 2.0 Ohm Range Adjustments
1.
.
There are no adjustments
necessary for the 20 Ohm, 200 Ohm, and 20
Kohm ranges.
2.
2.
3.
Adjust RV401 for a display indication of
10.00 Kohms.
for a dis-
play indication of .0000 ohms.
Connect the test leads to a 1.0 Ohm resistance
standard.
Check the 20 KOhm range with the
10.0 KOhm Standard Resistor.
Adjust RV403 on the DVM PCB
F-3-4. Verification of Each Ranges Accuracy
F-3-5 AC/DC Voltage Adjustments
Check the 20 ohm range with a 10 ohm resis-
tance standard. Check the 200 ohm range with a
100 ohm resistance standard. Check the 2.0
KOhm range with the 1.0 Kohm Standard
Resistor.
All resistance
ranges must be within the specifications out-
lined in Chapter B.
1. The adjustments for this section is difficult to
access, we recommend a simple
for all AC/DC Voltage and AC/DC
current measurements to
determine if the
AMPTEC 601 Safety DMM is adequately in
specification. If the AMPTEC 601ES DMM is
"in spec" you do not need to perform the adjust-
ment procedure described in the steps below. All
the adjustments described in this section are
performed on the DMM PCB (
).
2. Keeping all ribbon cables and wiring intact
between the various PCBs,
remove
the DVM PCB from its standoff mounts. (
verification
check first
first
carefully
see figure H-14
for PCB location, the DMM PCB is essentially
located below the DVM PCB and the I source
PCB
note:
20
