Agilent Technologies 437B User's Guide download pdf (Page 14)

5. Known Problems

The following cases are known problems when

using the E4419A or E4419B dual channel power

meter in 438A language compatibility mode.

1. With the E4419A dual channel power meter in

438A language mode, the data ready bit in the

status register will not be set when in measure-

ment mode B (measurement mode A is not

affected).

Symptom:

10 OUTPUT @Pm; “BE;BP;CS” !Measurement mode B

20 OUTPUT @Pm; “TR1” ! Or TR2

30 IF (BIT (SPOLL(@Pm), 0) ! Wait for data ready

THEN GOTO 30

40 ENTER @Pm;Pwr

Possible work-around:

10 OUTPUT @Pm; “BE;BP;CS”

20 OUTPUT @Pm; “TR1”

30 ENTER @Pm;Pwr

Having triggered the meter, the same effect can be

obtained by addressing the meter to talk and wait-

ing for the response. The result will not be returned

until the measurement cycle has completed.

The data ready bit is intended to allow the con-

troller to do other tasks, while periodically check-

ing the state of this bit. In TR2 mode with 512

averages, it could take 30 seconds before the result

is available.

This bug is corrected on the E4419B dual channel

power meter (firmware revision A.02.03 or higher).

2. With the E4419B dual channel power meter in

438A language mode, measurement error code

36 could be returned for either of the following

reasons:

• E-series sensor error on channel A (sensor

data suspect)

• The “must cal/zero” feature is enabled and

channel B requires calibrating or zeroing.

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Agilent Technologies 437B User's Guide Page 14