Result of measurement command is always zero

I'm having troubles getting a useful response from a measurement command.  The result is zero all the time, for every type of measurement.  Here's the setup:

Inject a 10kHz 4Vp-p sine wave from a signal generator into a TEK MSO5204B on channel 4.  Use SCPI commands to turn on CH4 and put the scope in "RUN" mode.

Send these SCPI commands:
MEASUrement:MEAS1:SOUrce CH4
MEASUrement:MEAS1:TYPE FREQUENCY;ACQUIRE:STATE ON
MEASUrement:MEAS1:VALue?

The scope's measurement setup page will show Frequency as measurement number 1 on CH4
The query returns the following result:

:MEASUREMENT:MEAS1:VALUE 0.00000000000 FREQ

I can parse out the value easily enough but the value should be 10 kHz, not zero.

Any suggestions?
Thanks.

After a lot of reading of the manual the solution is to turn on the measurement state, like this:

:MEASUrement:MEASx:SOUrce CHchannel;:MEASUREMENT:MEASx:STATE ON

Notice you need the semi-colon and leading colon of the second command that turns on the state of measurement, so the measurement actually happens.