Exhaust Port (Hard Vacuum Then Atm); Calibration Sled And Pmm - Fluke 6270A Service Manual

6270A
Service Manual

Exhaust Port (Hard Vacuum then ATM)

1. Install the highest range PMM that you have and make it the fixed range.
2. Set the PMM measurement mode to Absolute.
3. Install a shutoff valve on the test port.
4. Vent the system.
5. Apply a hard vacuum to the exhaust port.
6. Type in CAL:PRES7:VAL1 xx.xx (xx.xx = value in units must be absolute).
For this VAL1 use 0 psi absolute
7. Vent the vacuum port and vacuum pump to ATM.
8. Use a reference barometer to read the absolute ATM pressure in the units
and type this value for VAL2 below.
9. Type CAL:PRES7:VAL2 xx.xx (xx.xx = value in units must be absolute).
10. Type CAL:PRES7:SAVE

Calibration Sled and PMM

These tools are necessary to work on the calibration sled and PMMs:
•
3 mm hex
•
#2 Phillips Torque Driver
•
Loctite
See Figure 42:
1. Remove Cover . Use a 3 mm hex torque driver to remove the (4) Mx12
SHC screws .
2. Remove the connector bracket and cable assembly . Use 3 mm hex torque
driver remove the (1) M4x12 SHC screw  and the (1) M4x8 SCH screw .
3. Separate the connector bracket and cable assembly  from the manifold .
4. Remove the PMM guide rail . Use a #2 Phillips torque driver, remove the
(3) M4x8 socket head screws .
5. Remove the manifold  from the base plate . Use a 3 mm hex torque
driver to remove the (2) M4x8 SCH screws .
6. Remove the (4) feet  from the base plate .
70
222 or equivalent
TM