1 – 6
Getting Started
This exercise demonstrated the function of remote sensing in the
DC205. When operated in simple 2-wire mode, the commanded
output voltage is controlled internally. When a significant load is
presented (in this case, 50
Ω
), a current flows from the voltage source
through the circuit created by the output leads. In this case, with
1 V across 50
Ω
, a total of 20 mA flows through the output relays and
the banana test leads. Even 10 m
Ω
of lead resistance in this case will
lead to a 200
μ
V potential drop.
By enabling remote sensing in the
4-Wire
mode, the DC205 controls
the potential as measured by the sense leads. By carefully arranging
the SENSE wiring to not carry any of the load current, the desired
output voltage is applied at the point of interest (in this case, at the
multimeter input terminals).
1.5.2
Isolation
The CONFIG setting selects whether the output circuitry of the
DC205 is referenced to chassis ground or floating.
1. If the OUTPUT
On
indicator is lit, disable it by pressing the
[On
/
O
ff
] button.
2. Connect a pair of banana test leads from the red and black OUT-
PUT terminals on the DC205 to the input HI, LOW terminals
on the multimeter.
3. Press the [Range] button to select
±
1 V
. Press the [Float
/
Ground]
button to select
Floating
. Press [1] and then [Enter
/
Start] to set
the display to
.
4. Press the [On
/
O
ff
] button to enable the output. Verify that
+
1.0000 V appears on the multimeter.
5. Connect another banana test lead to the green chassis ground
terminal on the DC205 front panel. Connect the second end of
DC205 Precision DC Voltage Source