Table of Contents
Advertisement
PG9602™ OPERATION AND MAINTENANCE MANUAL
5.2.1.4
To view and adjust the output of the on-board relative humidity sensor.
To view the output of the relative humidity sensor, press [SPECIAL] and select
<3%RH>, <1view>. The display is:
To adjust the values of HA and/or HM press [SPECIAL] and select <3%RH>,
<2cal> to access a screen in which the values of HA and HM can be edited.
From here, press [ESC] and select <3%RH>, <1view> to view the relative
humidity sensor reading with the edited calibration coefficients applied.
5.2.1.5
To view and adjust the output of the on-board temperature sensors that are used
to measure the temperature of the piston-cylinder module.
The piston-cylinder module temperature is measured by two platinum resistance
thermometers (PRTs) embedded into the PG9000 mounting post. The two PRT
values are averaged to determine the piston-cylinder module temperature. The
resistances of the PRTs are read by PG9000's internal ohmic measurement
system and temperature is calculated as follows:
The PRTs are 10052 4-pole type following DIN Norm 43760.
supplied to the PRTs is 1 mA and the slope of resistance relative to temperature
over the valid temperature range of 0 to 40 °C is 0.3896 Ω/°C.
The uncertainty specification is ± 0.1 °C (± 0.04 Ω) with a resolution of 0.01 °C.
The ohmic measurement system in PG9000 is self-calibrated using on-board
100 and 107 Ω reference resistors.
The normal calibration procedure of the PRTs is to remove them from the
PG9000 mounting post and determine the offsets (actual resistances at 0 °C) by
calibration. To remove the PRTs from the PG9000 mounting post, follow the
instructions provided at the end of this section, Mounting Post PRT Removal.
© 2011 Fluke Calibration
Relative Humidity Sensor
PURPOSE
The relative humidity sensor is housed in the temperature -
humidity (TH) Probe along with the ambient temperature sensor.
Each sensor maintains its own calibration. See Section 5.2.1.3.
OPERATION
1.
Current reading of the relative humidity
sensor.
2.
Indication that this is a relative humidity
display.
3.
Current value of the Humidity Multiplier applied
to the relative humidity sensor reading.
4.
Current value of the Humidity Adder (always in %RH) applied to the relative humidity sensor
reading.
See Section 5.2.1.1 for an explanation of Adders and Multipliers
and their use in adjusting internal sensors.
Piston-Cylinder Module Temperature Sensors
PURPOSE
PRINCIPLE
Temperature = (Measured resistance - resistance at 0 °C) / slope
Page
Note
43.2 %RH
HA 5 %RH HM
Note
158
amb%RH
0.99984
The current
Advertisement
Table of Contents
