User`s manual

READ? The READ? command causes the E1326B multimeter to start taking

readings as soon as the trigger requirements have been met (see

INIT;:FETCh).

The

READ? command, however, causes NO RAM in the command module

(or E1300/E1301 mainframe) to be allocated for E1326B reading storage.

Instead, E1326B readings are placed directly in the HP-IB output buffer.

This is the mode of operation that should be used when readings need to be

taken at a continuous rate.

The controller needs to remove the readings at a rate such that the HP-IB

output buffer (128 characters) and the 512 word multimeter Data

SAMPle:SOURce TIM is used) does not overflow.

The readings in the multimeter’s Data Register are in the multimeter

internal format. For example:

• 10 µs aperture == one word per reading

• all other apertures == two words per reading

The readings in the output buffer are in the format specified by the

FORMat

command. For example, FORMat ASCII, FORMat REAL 32,

FORMat REAL 64.

Post Process Strain

and Temperature

Measurements

The temperature and strain measurements are computations done on voltage

and resistance measurements. The computations are done at the end of each

pass through a scan list. This computation limits the maximum speed.

With thermocouple temperature measurements, function changing times are

also involved in the measurements as the

RESistance function is used to

measure a 5000 Ω thermistor on the isothermal terminal block, and then the

voltage function is used to measure each thermocouple.

The method used to make fast temperature and strain measurements is to

make the measurements using the voltage and resistance functions. After

all measurements have been completed the computer can convert the

readings to the desired final units (i.e., temperature, strain). This maximizes

measurement speed, but also increases program complexity.

278 Measurement Speed and Accuracy Tradeoffs Appendix D