NOVELTY - The method involves using a source circuit and a sink circuit to provide stimulation pulses to a load (505) between two electrodes (E1, E2). Voltage across the source circuit and another voltage across the sink circuit are measured during the pulses. The measured voltages are used to adjust compliance voltage (V plus), where the compliance voltage is formed across series connection of the source circuit, the load and the sink circuit. The compliance voltage is generated from a lithium-ion polymer rechargeable battery within a stimulator device.    USE - Method for adjusting and monitoring compliance voltage used by an output current source/sink circuitry in a implantable medical simulator device (claimed) i.e. pulse generator, used in a spinal cord stimulation (SCS) system and a neural stimulation system in a patient's spinal column by a clinician. Can also be used for a non-medical and non-implantable device i.e. Transcutaneous Electrical Nerve Stimulator (TENS) device.    ADVANTAGE - The method enables measuring output voltages across the current source and the sink circuitry during periods of actual stimulation when current sources and sinks adjust the compliance voltage so as to reduce the output voltages within guard band values. The method enables monitoring output voltages during periods between stimulation pulses so as to improve accuracy of measurement. The method enables reducing the compliance voltage reduced without significant risk of impacting circuit performance. The method enables performing non-active measurements so as to improve accuracy of compliance voltage adjustment without affecting therapy regimen.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for an implantable medical simulator device comprising a source circuit.    DESCRIPTION OF DRAWING(S) - The drawing shows a circuit diagram of a current source/sink circuitry for measuring output voltages in a current source and a sink circuitry.    Electrodes (E1-E8)    Compliance voltage (V plus)    Output transistors (502-1, 502-4, 503-3, 503-4)    Load (505)    Selection transistors (513-1, 513-3', 513-4, 513-5')