Measuring voltage 10 times every second with HP 34401A DMM
You can find out from the manual;

:NPLCycles?


Or choose 1 cycle for 50Hz sample rate or 20ms integration time
or 10 cycles (PLC) for a 5Hz sampling rate or 200ms integration time 


( if you are in 50 Hz land ;)



I guess if you want a 10 sample/s rate it is NPLC=1 and Delay = 80ms

:NPLCycles {0.02|0.2|1|10|100|MINimum|MAXimum}

Select the integration time in number of power line cycles for the present
function (the default is 10 PLC). This command is valid only for dc volts,
ratio, dc current, 2-wire ohms, and 4-wire ohms. MIN = 0.02. MAX =
100.

For 1k readings/s

*RST
*CLS
DISPlay OFF
FUNCtion ""
:RESolution MAXimum
:NPLCycles MINimum
ZERO:AUTO OFF
:RANGe:AUTO OFF
CALCulate:STATe OFF
TRIGger:SOURce IMMediate
TRIGger:DELay 0 
READ?