The HV225 is a special purpose hipot tester with the capability to test electromechanical relays. Commands sent over a common RS232 serial port program applied voltage, dwell time, and relay under test (RUT) contact configuration. Dielectric leakage current is monitored and read back during the test.

HV225 Hipot tester Command List
"clear" - Turn off HV, clear status bits.

"getstat" - Return current status byte.
"hvon" -
"hvoff" - Turn off HV.
"hipv1on" - Set meas. range (RANGE), ramp up to HipV1 for DWELL mS.
"hipv2on" - Set meas. range (RANGE), ramp up to HipV2 for DWELL mS.
"hipv3on" - Set meas. range (RANGE), ramp up to HipV3 for DWELL mS.
"hipv4on" - Set meas. range (RANGE), ramp up to HipV4 for DWELL mS.
"measure" - Return leakage current and HV reference V.
"setbank1" - Set relay card with m.s byte of BANK.
"setbank2" - Set relay card with l.s byte of BANK.
"setbanks" - Set relay cards with value in BANK.

HV225 Hipot tester Condition List
"hipv1" - Hipot programmable voltage 1.
"hipv2" - Hipot programmable voltage 2.
"hipv3" - Hipot programmable voltage 3.
"hipv4" - Hipot programmable voltage 4.
"rate" - Determines speed of applied HV.
"limit" - Sets max. leakage level before trip.
"range" - Determines high or low sense measurement range.
"code" -
"bank" - Data for "setbank" command.
"dwell" - HV "on" time in mS.

Data Syntax and Format
All communication via serial Com port sent 8 data, even parity, 9600 baud.
The command line is sent as a plain ASCII text string with <CR> or <CR><LF> terminating.
Example:
"hipv1=750 dwell=200 hipv1on \n" will turn on the high voltage for 200mS at 750VDC.
Commands must be separated by a space or comma; both may be used for readability. "measure" and “getstat” should be followed by a read of the Com port. Data returned will consist of a string with the following format: <c><nnnnn><sp> <mmmm><sp> <CR><LF> where c is a binary number indicating the number of data to come (2 in this case), nnnn is the first data measurement as an ASCII string and mmmm is the second measurement.
You have to read current while HV is on. This means that after sending “hipv1on”, you have to send “measure” before the dwell time ends. The “measure” command returns two data; the first is the leakage current (in µA), and the second is an internal reference voltage which may be ignored for most applications.