Measuring voltages over +-15V on NI4351 and effects on resolution

[JAH 312]

Hi,
I'm using the TBX-68T accessory with an NI4351 PCI card to take simultaneous measurements of temperature, current and voltage, using LabWindows CVI 5.5. Using the voltage drop developed across a 1 ohm resistor, I need to measure currents as low as 50uA. Ideally, I also need to measure voltages up to 32V on another channel. Is there a way of measuring voltages beyond the +-15V without having to use external circuitry (such as an amplifier with a gain under 0.5)? I heard that although the voltage range for each channel can be specified separately, the channel with the maximum range dictates the resolution for all channels. Is this true? (It would seem to defeat the purpose of being able to configure th
e range of individual channels.) Thanks in advance.

[billhodges]

Since the maximum range is +/- 15V, there is no way to measure a voltage of 32V without external hardware.

In terms of the different ranges, the NI-435X driver does set the resolution based on the maximum range of channels.

Reference this KB to see this information:
http://digital.ni.com/public.nsf/websearch/0089A4BD2A71379086256C0F004F88D5?OpenDocument