[Elecraft] KAT500 Sleep current?

[Andy Durbin]

"Off" and "sleep" are not the same states.  Also "Off" is not the same state as "not powered".

"PS Power on/off
GET format: PS;
SET/RESPONSE format: PS0; or PS1;
Turns the KAT500 ON (PS1;) or OFF (PS0;).
The KAT500’s microcontroller operates whenever DC power is applied. LEDs and relays are off (Antenna 1, bypassed) when the KAT500 is “logically off”. See the SL command.
This command may be ignored while transmitting.
PS; and PS1; were added in firmware version 01.20."

"SL Sleep when Idle
GET format: SL;
SET/RESPONSE format: SL0; (disable) or SL1; (enable)
SL1; causes the KAT500 microcontroller (MCU) to enter a low power and electrically quieter “sleep” mode when switched off or when idle. The 16 MHz crystal oscillator is turned off while sleeping."

Anyone interested in the current draw for Sleep and Off (but powered) states could simply put a multimeter in the PSU lead.  I would expect a difference in current between Off and Sleep that would depend strongly on the number of tuning relays that were active while sleeping.  No relays are active when Off.

Andy, k3wyc