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Model 7708 M ultiplexer M odule I nstructions for use with DAQ6510 12 077144500 / April 2018 Before installing or removing a switching module, make sure the D AQ6510 power is turned off and disconnected fro m line pow er…
Model 7708 Multiplexer Module Instructions for use with DAQ6510
077144500 / April 2018 11
Before installing or removing a switching module, make sure the DAQ6510 power is turned
off and disconnected from line power. Failure to comply may result in incorrect operation and
loss of data in the memory.
Required equipment:
▪ Medium flat-blade screwdriver
▪ Medium Phillips screwdriver
To install switching module into the DAQ6510:
1. Turn off the DAQ6510.
2. Disconnect the power cord from the power source.
3. Disconnect the power cord and any other cables that are connected to the rear panel.
4. Position the DAQ6510 so you are facing the rear panel.
5. Use the screwdriver to remove the slot cover screws and the cover plate. Retain the plate and screws for
future use.
6. With the top cover of the switching module facing up, slide the switching module into the slot.
7. Press the switching module in firmly to make sure the switching module connector is connected to the
DAQ6510 connector.
8. Use the screwdriver to tighten the two mounting screws to secure the switching module to the mainframe.
Do not overtighten.
9. Reconnect the power cord and any other cables.
Remove a switching module
Before you remove a switching module, or begin any testing, make sure that all of the relays are
open. Since some relays may be latched closed, you must open all of the relays before removing the
switching module to make connections. Additionally, if you drop your switching module, it is possible
for some relays to latch closed.
To open all channels select Menu > Control > Open. If there are no channels closed, the Open button is not
selectable.If any channel is closed, then the Open button is active and selecting it will open all channels.
To prevent electric shock that could result in injury or death, never handle a switching
module that has power applied to it. Before installing or removing a switching module, make
sure the DAQ6510 is turned off and disconnected from line power. If the switching module is
connected to a DUT, make sure power is removed from all external circuitry.
If a card slot is unused, you must install slot covers to prevent personal contact with high
voltage circuits. Failure to install slot covers could result in personal exposure to hazardous
voltages, which could cause personal injury or death if contacted.
Model 7708 Multiplexer Module Instructions for use with DAQ6510
12 077144500 / April 2018
Before installing or removing a switching module, make sure the DAQ6510 power is turned
off and disconnected from line power. Failure to comply may result in incorrect operation and
loss of data in the memory.
Required equipment:
▪ Medium flat-blade screwdriver
▪ Medium Phillips screwdriver
To remove switching module from the DAQ6510:
1. Turn off the DAQ6510.
2. Disconnect the power cord from the power source.
3. Disconnect the power cord and any other cables that are connected to the rear panel.
4. Position the DAQ6510 so you are facing the rear panel.
5. Use the screwdriver to loosen the mounting screws that secure the switching module to the mainframe.
6. Carefully remove the switching module.
7. Install a slot plate or switching module in the empty slot.
8. Reconnect the power cord and any other cables.
Operation
This switching module does not support current measurements. If the instrument has the TERMINALS switch
set to REAR and you are working with the slot that contains this switching module, the AC , DC , and digitize
current functions are not available. You can measure current using the front panel or using another slot that
contains a switching module that supports the AC , DC , and digitize current measurements.
If you use remote commands to attempt to measure current when configuring a channel, an error is returned.
Performance verification
The performance of the module is tested by verifying the accuracy of measurements made through the module.
If verification limits are met through the front-panel terminals of the DAQ6510, they should also be met through
the module.
Do not attempt to perform this procedure unless qualified to do so. Failure to recognize and
observe normal safety precautions could result in personal injury or death.
Measurement accuracy through the module should only be verified after instrument accuracy has
been verified through the front-panel terminals of the DAQ6510. Refer to the DAQ6510 Calibration
and Adjustment manual (documentation number DAQ6510-905-01) for verification information.
Model 7708 Multiplexer Module Instructions for use with DAQ6510
077144500 / April 2018 13
This verification procedure requires that the DAQ6510 be within its calibration interval.
Module verification test procedures include:
▪ DC volts
▪ AC volts
▪ Resistance
▪ Temperature
▪ Frequency
▪ Ratio and average
Make sure that you perform the verification tests using the following conditions:
▪ Under the proper environmental conditions
▪ After the specified warm-up period
▪ With connections made to the correct input terminals
▪ Using the correct line voltage
▪ With the TERMINALS switch in the REAR position
▪ With the proper calibration equipment and the reading limits provided with the verification procedures. See
Calculating resistance reading limits (on page 14) for more information.
Environmental conditions
Conduct your performance verification procedures in a test environment that has:
▪ An ambient temperature of 18 °C to 28 °C.
▪ A relative humidity of less than 80% unless otherwise noted.
Warm-up period
Allow the DAQ6510 to warm up for at least one hour before verifying the module.
If the instrument has been subjected to temperature extremes (those outside the ranges stated above), allow
additional time for the internal temperature of the instrument to stabilize. Typically, allow one extra hour to
stabilize an instrument that is 10 °C outside the specified temperature range.
Allow the test equipment to warm up for the minimum time specified by the manufacturer.
Example reading limit calculation
The following is an example of how reading limits have been calculated. Assume you are testing the 10 VDC
range using a 10 V input value. Using the DAQ6510 one-year accuracy specification for 10 VDC of ± (25 ppm
of reading + 5 ppm of range), the calculated limits are:
Reading limits = 10 V ± [(10 V 25 ppm) + (10 V 5 ppm)]
Reading limits = 10 V ± (0.00025 + 0.00005)
Reading limits = 10 V ± 0.00030 V
Reading limits = 9.99970 V to 10.00030 V