Rice Lake Simulators - Manual (Page 10)

6 Ranger Simulator Operation Guide
3.0 Ranger 7 Simulator Operation
0.5mV/V
ZERO
0.01mV/V 0.1mV/V
+EXC –EXC +SIG –SIG
X4
X1
X.5
.04
.03
.02
.01
.00 .06
.07
.08
.09
.10 .05
.4
.3
.2
.1
.0
2.5
2.0
1.5
1.0
0.5
0.0
+ –
EXC
.0
PUSH TO ENABLE
HOLD TO CHANGE RANGE
0.5mV/V
VARIABLE
0.1mV/V
PUSH TO ENABLE
±25μV/V
OFFSET
ON + –
High Resolution Load Cell Simulator
Switch One Switch Two Switch Three
Variable Switch
Offset Switch
EXC LEDs
Toggle Switch
Binding Posts
Figure 3-1. Ranger 7 Simulator
3.1 Standard Operation
3.1.1 Switches
The three switches across the bottom front face of the Ranger 7 work together up to 3 mV/V.
• Switch one maximum = 2.5
• Switch two maximum = .4 (has two .0 settings, they are identical settings)
• Switch three maximum = .10 (
ZERO
position puts the mV/V output setting to zero regardless of the other
switch settings)
Note
When switch three is set to ZERO, only the offset switch can vary the output in this setting. This allows an easy
way to check AZM settings as well as quick return to zero for time testing.
Example:
Switch one is set to 2mV/V, switch two is set to 0.0 and switch three is set to .00. By setting switch three to the
ZERO position, the output will instantly jump between 2mV/V and 0mV/V.
3.1.2 Toggle Switch Load Control
•
X1
mode – load is 350Ω, equivalent to a single standard load cell
•
X.5
mode – load is 700Ω, providing a lightly loaded system
•
X4
mode – load is 87.5Ω which is equivalent to a 4 load cell platform scale
3.1.3 EXC LEDs
An indication of excitation voltage presence, indicating the polarity of the excitation to aid in proper wiring.
If both LEDs are lit, it indicates AC excitation.
Note
The Ranger 7 works with all polarities of excitation as long as the peak or DC voltage is between 3.5V and 12V.
3.1.4 To Simulate a Larger Load
1. Place a power resistor between the EXC+ and EXC- binding posts. Use a 22Ω 7.5W resistor for excitation
up to 10V.
2. Put the load switch in the
X.5
position. Calculate the required resistance using
R=(700 x X)/(700 - X)
.
X
is the
desired load.