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5.6 Power On Self-Test
When power is turned on, the 1529 performs a self-test checking the system, all chan-
nels, calibration, GPIB, memory, and buttons. If an error occurs, an error message is
displayed. See Section 10.1, Troubleshooting on page 125 for additional information
on error messages.
5.7 Display Backlight and Contrast
The display backlight is adjustable for use in varying lighting conditions. The four
backlight modes are accessible in the CHANNEL menu DISPLAY OPTIONS func-
tion. If the display appears faded, dark, or blank, adjust the contrast (off, low, medium,
high) using the front panel contrast buttons.
5.8 Taking Measurements
The procedure for configuring the 1529 thermometer readout to take measurements
on a particular input channel requires the following: (1) connecting the sensor to the
appropriate input channel , (2) enabling the channel, and (3) selecting the conversion
type and probe characterization values.
5.8.1
Connecting the Sensor
Connect the sensor to the RTD/Thermistor channel(s) or thermocouple channel(s) that
you want to measure. Refer to Section 5.4, Probe Input Modules on page 18, for ad-
ditional information.
5.8.2
Enabling the Channel
Channels are set first by selecting either simultaneous or scan mode in the CHANNEL
menu CHANNEL MODE function. Simultaneous mode shows one to four channels
in the upper display simultaneously. Scan mode shows one channel at a time (in large
digit format) scanning through one to four channels depending on the channels that
are enabled. After the mode has been selected, use the CHANNEL menu ENABLE
CHANNEL function, to select the channel to be displayed. Any channel set to 'Off' is
not displayed. See Section 6.1.3, Channel Mode on page 26, and Section 6.1.2, Enable
Channel on page 26, for more information.
5.8.3
Selecting Conversion Type and Probe Characterization
Before the 1529 can accurately measure temperature, it must be configured to calcu-
late temperature from the resistance or voltage of the sensor. There are many tempera-
ture conversion algorithms available and the one to use depends on the type of sensor
and its calibration. Many conversion algorithms use coefficients that characterize the
sensor. Coefficients are determined when the sensor is calibrated. SPRTs and RTDs
often use the ITS-90 algorithms and are provided with ITS-90 characterization coef-
ficients. Thermistors often use the Steinhart-Hart algorithms and coefficients. Thermo-
couples use standard tables or equations depending on its type. For additional informa-
tion on conversion types, see Section 6.2, Probe Menu on page 29.
General Operation
Taking Measurements
21
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