Fluke 721 - Page 20

721
Users Manual
12
30V
24mA
MAX
V
mA
COM
F1 F2 F3
ZERO
Pressure
Switch
Use low volume tubing
when possible
hmq017.eps
Figure 3. Pressure Switch Connection
To do a switch test:
1. Use the P1, P2, or external pressure input
connections to connect the Product to the input of the
switch. Connect the contact output of the switch to
the COM and V mA terminals of the Product. The
polarity of the terminals does not matter.
2. Connect the pump to the Product and the pressure
switch.
3. Make sure the vent on the pump is open.
4. Zero the Product if necessary.
5. Close the vent after the Product is zeroed.
6. Push  to select P1, P2, or EXT depending on how
the Product is connected.
7. If connected to a normally closed switch, the top of
the display will read “CLOSE”.
8. Slowly apply pressure with the pump until the switch
opens.
Note
In the SWITCHTEST mode the display update
rate is increased to help capture changing
pressure inputs. Even with this enhanced
sample rate pressurizing, the test should be
done slowly to ensure accurate readings.