EmStat Pico - Simultaneous Separate Tests

Hi nmcgillbg,

Your conclusion that the "poly_we" command is not suitable for your purpose is correct. It is meant to be used when you just want to add an extra WE to the same experiment.

It is already possible to use two channels somewhat parallel to each other, provided both channels use the low speed mode. Note that this will only work if the sensors do not share any electronical connection. Both channels are able to be configured independently and these settings will still be applied even when the channel is not selected. However, the "meas_loop_*" commands cannot run a technique on two channels at a time. You can, however, switch to a separate channel and sample an electrode using the "meas" command.

Note that the two measurements will be offset from each other in time, as the EmStat Pico you can only sample one value at a time. But you will be able to measure both channels in one iteration.

In the case of your CA that also does an OCP channel, the MethodSCRIPT would look something like this:

e
var c
var p
var t
#init OCP channel (keep cell off)
set_pgstat_chan 0
set_pgstat_mode 2
set_max_bandwidth 40
set_pot_range 300m 300m
set_cr 590u
set_autoranging 590u 590u
#init CA channel
set_pgstat_chan 1
set_pgstat_mode 2
set_max_bandwidth 40
set_pot_range 300m 300m
set_cr 590u
set_autoranging 59n 590u
cell_on
timer_start
#Pick CA as measurement, we can measure CH1 OCP inside the meas_loop_ca
#potential(V[out]), current(A[out]), potential setpoint (V[in]), interval (s[in]), total runtime (s[in])
meas_loop_ca p c 300m 100m 120100m
    #measure OCP on channel 0
    set_pgstat_chan 0
    #measure potential(ab) for 25m and put result in p
    meas 25m p ab
    #switch back to chan 1 for next iteration
    set_pgstat_chan 1
    timer_get t
    pck_start
    pck_add t
    pck_add c
    pck_end
endloop
on_finished:
cell_off

I don't expect we will be able to implement parallel measurement loops in the near future.

Kind regards,

Hielke

Hi nmcgillbg,

Your conclusion that the "poly_we" command is not suitable for your purpose is correct. It is meant to be used when you just want to add an extra WE to the same experiment.

It is already possible to use two channels somewhat parallel to each other, provided both channels use the low speed mode. Note that this will only work if the sensors do not share any electronical connection. Both channels are able to be configured independently and these settings will still be applied even when the channel is not selected. However, the "meas_loop_*" commands cannot run a technique on two channels at a time. You can, however, switch to a separate channel and sample an electrode using the "meas" command.

Note that the two measurements will be offset from each other in time, as the EmStat Pico you can only sample one value at a time. But you will be able to measure both channels in one iteration.

In the case of your CA that also does an OCP channel, the MethodSCRIPT would look something like this:

e
var c
var p
var t
#init OCP channel (keep cell off)
set_pgstat_chan 0
set_pgstat_mode 2
set_max_bandwidth 40
set_pot_range 300m 300m
set_cr 590u
set_autoranging 590u 590u
#init CA channel
set_pgstat_chan 1
set_pgstat_mode 2
set_max_bandwidth 40
set_pot_range 300m 300m
set_cr 590u
set_autoranging 59n 590u
cell_on
timer_start
#Pick CA as measurement, we can measure CH1 OCP inside the meas_loop_ca
#potential(V[out]), current(A[out]), potential setpoint (V[in]), interval (s[in]), total runtime (s[in])
meas_loop_ca p c 300m 100m 120100m
    #measure OCP on channel 0
    set_pgstat_chan 0
    #measure potential(ab) for 25m and put result in p
    meas 25m p ab
    #switch back to chan 1 for next iteration
    set_pgstat_chan 1
    timer_get t
    pck_start
    pck_add t
    pck_add c
    pck_end
endloop
on_finished:
cell_off

I don't expect we will be able to implement parallel measurement loops in the near future.

Kind regards,

Hielke

Thank you Hielke!  This seems like a great short term solution for me.