CHAPTER F - CALIBRATION AND MAINTENANCE
F-1.
General
This section of the manual contains routine
maintenance information regarding the
AMPTEC RESEARCH 601ES Safety DMM.
Calibration should be performed on a regular
basis to ensure continued instrument accuracy
or following a main PCB electronic component
repair/replacement. The recommended
calibration interval is 1 year.
in order to eliminate lead resistance
and contact resistance errors. The Option “300”
is a gold plated 4 Wire Kelvin Clip Test Lead
set that is available with the AMPTEC 601ES
DMM.
AMPTEC 601ES DMM Calibration note:
verify @ 60Hz
For the resistance function, the AMPTEC
601ES Safety DMM must be calibrated using
four wire Kelvin connections to the resistance
standard
F-2.
Required Test Equipment
Following standard resistors are required to
calibrate the 601ES Explosive Safety Meter
Igniter Tester .
1 ohm ± 0.01% Accuracy
10 ohms ± 0.005% Accuracy
1000 ohms ± 0.005% Accuracy
10 Kohms ± 0.01% Accuracy
600 V ± 0.05% or better accuracy
100 V ± 0.05% or better accuracy
10 V ± 0.05% or better accuracy
1.0 V ± 0.05% or better accuracy
600 V ± 0.05% or better accuracy
100 V ± 0.05% or better accuracy
10 V ± 0.05% or better accuracy
1.0 V ± 0.05% or better accuracy
1.0 ampere ± 0.05% or better accuracy
Precision Resistance Standards:
DC Voltage Standard:
AC Voltage Standard:
AC/DC Current Standard:
F-3. Calibration Procedure
F-3-1. Zero Offset Adjustment
1.
2.
A.
DMM
Function and
Following a full 15 minute warm-up
period
Only
Out of Specification
Section B
No adjustments are needed
-
- Verify each function and range with the
appropriate calibration standards to determine if
the AMPTEC 601ES DMM meets its published
accuracy specifications as published in Section B
( p.7).
- If the 601ES meets the specifi-
cations as compared with traceable standards then
it is ready to certify with a calibration sticker etc.
and "
".
its the PCB directly under
the "
" functions
(
) need to be addressed with any adjust-
ment procedure
The 601ES
DMM requires fully charged batteries and a full 15
minute warm-ip period prior to any adjustments.
The calibration adjustments are accessed by
removing the 10 calibration access screws around
the perimeter of the 601ES
front panel, then
lifting off the top plate by the handles. The
locations of the adjustments are shown on drawing
number 601ES Explosive Safety Meter-600 at the
back of this manual.
Any zero offset greater than the specification (
0.05% of range which is 00.10 on the 20 Kohm
range) then adjust as noted
(see figure H-14 in the back of the manual for
the DVM PCB location -
With the AMPTEC 601ES DMM in 4 Wire mode,
select the 20 Kohm range. Short the four Wire
Kelvin Leads together at the ends.
next. If the zero reading
is >00.10 then adjust potentiometer RV405 to be as
close to 00.00 as possible ( its located on the DVM
PCB)
Verification of Each
Ranges
Accuracy
Use caution when lifting the
601ES top panel up by the handles
, as there is
umbilical wiring that connects the top panel
electronics to battery pack wiring and chassis/case
ground wiring mounted inside the bottom of the
601ES case. Set the top panel on end resting on the
unit’s bezel.
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