Calibrators
Calibration Adjustment
39
Pressure Module Input (725/726)
1. Connect a Fluke 700 Series Pressure Module to the 5-pin LEMO connector at the top
of the UUT; then press U.
2. Verify that the display first shows -----psi, then changes to a pressure value.
3. Disconnect the pressure module from the UUT.
The performance tests for the 725 and 726 are now complete. Disconnect and secure all test
equipment.
Calibration Adjustment
The Calibrators have electronic calibration. There are no mechanical adjustments and the
calibration is done case closed. The calibration is done via serial communications port, by
sending and receiving commands and readings. For the 725 and 726 serial port
connection, you may use the 700SC Serial Interface Cable, PN 667425. This will permit
communication through the pressure port connection. The 724/725 Calibration Cable, PN
1556747 is required for the 724
, and can be used with the 725 and 726.. This connects to
the 10-pin header in the battery compartment.
Throughout these procedures, the Calibrators are referred to as “UUT” (Unit Under Test).
Two methods of calibration are available for the UUT: using a serial-based program via a
PC (see Table 6 for requirements), and using a Met/Cal calibration procedure. This
manual only describes the serial-based PC program. The automated Met/Cal procedures
are available from the Fluke Metrology Group. For more information on the automated
Met/Cal procedures contact Fluke or visit the Fluke Web site at www.fluke.com
.
As long as the calibrators have been within at a stable temperature within the range of
18
ºC to 28 ºC for an hour or more, they only need 5 minutes to warm up. If temperature
conditions were previously below 10
ºC or higher then 40 ºC, then the Calibrator must be
allowed to stabilize for a minimum of 3 hours prior to calibration.
The Calibrators should be calibrated at the required interval (defined by the factory as 1
year).
Setup
Setup the PC and UUT as follows:
1. Ensure that the terminal communications software is installed on the PC (such as
Hyper Terminal or PcPlus).
2. Connect the interface cable to the appropriate connector on the UUT. Remove the
jumper beside the ten-pin connector when using the 724/725 Calibration Cable on a
725. Replace the jumper after calibration is complete.
3. Connect the 9-pin 'D' connector to the PC serial port. An adapter may be needed for
PCs that use 25-pin 'D' serial connectors.
4. Verify the settings on the PC are as follows:
• Bits per second: 9600
• Data bits: 8
• Parity: None
• Stop bits: 1
• Flow control: None
• Local echo on
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